Search Results - "Gullberg, G.T."

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  1. 1

    Tomographic reconstruction using an adaptive tetrahedral mesh defined by a point cloud by Sitek, A., Huesman, R.H., Gullberg, G.T.

    Published in IEEE transactions on medical imaging (01-09-2006)
    “…Medical images in nuclear medicine are commonly represented in three dimensions as a stack of two-dimensional images that are reconstructed from tomographic…”
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    Journal Article
  2. 2

    Unmatched projector/backprojector pairs in an iterative reconstruction algorithm by Zeng, G.L., Gullberg, G.T.

    Published in IEEE transactions on medical imaging (01-05-2000)
    “…Computational burden is a major concern when an iterative algorithm is used to reconstruct a three-dimensional (3-D) image with attenuation, detector response,…”
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  3. 3

    Normal and Pathological NCAT Image and Phantom Data Based on Physiologically Realistic Left Ventricle Finite-Element Models by Veress, A.I., Segars, W.P., Weiss, J.A., Tsui, B.M.W., Gullberg, G.T.

    Published in IEEE transactions on medical imaging (01-12-2006)
    “…The four-dimensional (4-D) NURBS-based cardiac-torso (NCAT) phantom, which provides a realistic model of the normal human anatomy and cardiac and respiratory…”
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  4. 4

    Reconstruction From Uniformly Attenuated SPECT Projection Data Using the DBH Method by Qiu Huang, Jiangsheng You, Zeng, G.L., Gullberg, G.T.

    Published in IEEE transactions on medical imaging (01-01-2009)
    “…An algorithm was developed for the 2-D reconstruction of truncated and nontruncated uniformly attenuated data acquired from single photon emission computed…”
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  5. 5

    Total variation regulated EM algorithm [SPECT reconstruction] by Panin, V.Y., Zeng, G.L., Gullberg, G.T.

    Published in IEEE transactions on nuclear science (01-12-1999)
    “…An iterative Bayesian reconstruction algorithm based on the total variation (TV) norm constraint is proposed. The motivation for using TV regularization is…”
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  6. 6

    Correction for ambiguous solutions in factor analysis using a penalized least squares objective by Sitek, A., Gullberg, G.T., Huesman, R.H.

    Published in IEEE transactions on medical imaging (01-03-2002)
    “…Factor analysis is a powerful tool used for the analysis of dynamic studies. One of the major drawbacks of factor analysis of dynamic structures (FADS) is that…”
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  7. 7

    Comparison of channelized hotelling and human observers in determining optimum OS-EM reconstruction parameters for myocardial SPECT by Gilland, K.L., Tsui, B.M.W., Yujin Qi, Gullberg, G.T.

    Published in IEEE transactions on nuclear science (01-06-2006)
    “…The performance of the Channelized Hotelling Observer (CHO) was compared to that of human observers for determining optimum parameters for the iterative OS-EM…”
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  8. 8

    Direct least-squares estimation of spatiotemporal distributions from dynamic SPECT projections using a spatial segmentation and temporal B-splines by Reutter, B.W., Gullberg, G.T., Huesman, R.H.

    Published in IEEE transactions on medical imaging (01-05-2000)
    “…Artifacts can result when reconstructing a dynamic image sequence from inconsistent, as well as insufficient and truncated, cone beam single photon emission…”
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    Journal Article Conference Proceeding
  9. 9

    Cardiac Imaging Using a Four-Segment Slant-Hole Collimator by Bal, G., DiBella, E.V.R., Gullberg, G.T., Zeng, G.L.

    Published in IEEE transactions on nuclear science (01-10-2006)
    “…The main objective of this paper is to evaluate four-segment slant-hole (FSSH) SPECT for cardiac imaging. FSSH is a slant-hole collimator that is divided into…”
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  10. 10

    Toward accurate attenuation correction in SPECT without transmission measurements by Welch, A., Clack, R., Natterer, F., Gullberg, G.T.

    Published in IEEE transactions on medical imaging (01-10-1997)
    “…The current trend in attenuation correction for single photon emission computed tomography (SPECT) is to measure and reconstruct the attenuation coefficient…”
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  11. 11

    Cardiac single-photon emission-computed tomography using combined cone-beam/fan-beam collimation by Gullberg, G.T., Zeng, G.L.

    Published in IEEE transactions on nuclear science (01-02-2005)
    “…The objective of this work is to increase system sensitivity in cardiac single-photon emission-computed tomography (SPECT) studies without increasing patient…”
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  12. 12

    Accuracy and precision of compartmental model parameters obtained from directly estimated dynamic SPECT time-activity curves by Reutter, B.W., Gullberg, G.T., Huesman, R.H.

    Published in IEEE transactions on nuclear science (01-02-2004)
    “…Quantitative kinetic analysis of dynamic cardiac single photon emission computed tomography (SPECT) data has the potential to provide better contrast between…”
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  13. 13

    A channelized-hotelling-trace collimator design method based on reconstruction rather than projections by Zeng, G.L., Gullberg, G.T.

    Published in IEEE transactions on nuclear science (01-10-2002)
    “…In this paper, a new single-photon emission-computed tomography (SPECT) collimator design technique is investigated. In this feasibility study, the collimator…”
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  14. 14

    Evaluation of parallel and fan-beam data acquisition geometries and strategies for myocardial SPECT imaging by Yujin Qi, Tsui, B.M.W., Gilland, K.L., Frey, E.C., Gullberg, G.T.

    Published in IEEE transactions on nuclear science (01-06-2004)
    “…This study evaluates myocardial SPECT images obtained from parallel-hole (PH) and fan-beam (FB) collimator geometries using both circular-orbit (CO) and…”
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  15. 15

    Parametric image formation using clustering for dynamic cardiac SPECT by Bal, H., DiBella, E.V.R., Gullberg, G.T.

    Published in IEEE transactions on nuclear science (01-10-2003)
    “…Dynamic cardiac SPECT imaging can provide quantitative and possibly even absolute measures of physiological parameters. However, a dynamic cardiac SPECT study…”
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  16. 16

    The prolate spheroidal transform for gated SPECT by Feng, B., Sitek, A., Gullberg, G.T.

    Published in IEEE TRANS NUCL SCI (01-06-2001)
    “…Proposes a method to calculate the volume and surface area of the left ventricle (LV) in the prolate spheroidal coordinate system. The prolate spheroidal…”
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    Journal Article Conference Proceeding
  17. 17

    Deformable model of the heart with fiber structure by Sitek, A., Klein, G.J., Gullberg, G.T., Huesman, R.H.

    Published in IEEE transactions on nuclear science (01-06-2002)
    “…A kinematic model of the heart with incompressibility constraints was implemented. It accounts for the effects of the heart fiber structure, which plays a…”
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  18. 18

    Nonuniform attenuation correction using simultaneous transmission and emission converging tomography by Tung, C.-H., Gullberg, G.T., Zeng, G.L., Christian, P.E., Datz, F.L., Morgan, H.T.

    Published in IEEE transactions on nuclear science (01-08-1992)
    “…Photon attenuation in cardiac single photon emission computed tomography (SPECT) is a major factor contributing to the quantitative inaccuracy and the decrease…”
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  19. 19

    Cone-beam iterative reconstruction of a segment of a long object by Zeng, G.L., Gullberg, G.T., Christian, P.E., Gagnon, D.

    Published in IEEE transactions on nuclear science (01-02-2002)
    “…This study was performed to investigate the iterative reconstruction of a segment of a long object using cone-beam projections acquired with a practical-sized…”
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  20. 20

    Asymmetric cone-beam transmission tomography by Zeng, G.L., Gullberg, G.T., Christian, P.E., Gagnon, D., Chi-Hua Tung

    Published in IEEE TRANS NUCL SCI (01-02-2001)
    “…Transmission scans are an important part of the process of obtaining patient attenuation maps for accurate SPECT (single photon emission computed tomography)…”
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    Journal Article Conference Proceeding